import jwt_decode from "jwt-decode";
var token = "eyJ0eXAiO...";
var decoded = jwt_decode(token);
console.log(decoded);
/* prints: * { foo: "bar", *   exp: 1393286893, *   iat: 1393268893  } */

let b64DecodeUnicode = str => decodeURIComponent( Array.prototype.map.call(atob(str), c => '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2) ).join(''))
let parseJwt = token => JSON.parse( b64DecodeUnicode( token.split('.')[1].replace('-', '+').replace('_', '/') ) )

{"tags":[{"tag":"textarea","content":"import jsonwebtoken from 'jsonwebtoken';\n\nconst getDecodedJwt = async (token: string) => {\n return jsonwebtoken.decode(token);\n};","code_language":"javascript"}]}

jwt.decode( token, SECRET_KEY, algorithm='HS256' )

HMACSHA256( base64UrlEncode(header) + "." + base64UrlEncode(payload),
) secret base64 encoded

import { JwtHelperService } from "@auth0/angular-jwt";
constructor(private jwtHelper: JwtHelperService) {}
// DDECODIFICA TOKEN
CheckUser(): void {	this.role = this.GetUserRole();	this.username = this.GetUsername();	const token = this.tokenGetter();	if (token && this.jwtHelper.isTokenExpired(token)) {	alert("Sessione scaduta!");	this.router.navigate(["login"]);	return;	}	if (token && !this.jwtHelper.isTokenExpired(token)) {	this.isLogged = true;	if (this.role === "User") {	this.adminMode = false;	} else {	this.adminMode = true;	} }	console.log("logged?: " + this.isLogged);	console.log("role: " + this.role);	console.log("username: " + this.username);	console.log("adminMode?: " + this.adminMode);
}
tokenGetter() {	return localStorage.getItem("token");
}
GetUserRole() { const token = this.tokenGetter(); if (!token) { return; } let tokenData = this.jwtHelper.decodeToken(token); let role = tokenData[ "http://schemas.microsoft.com/ws/2008/06/identity/claims/role" ]; return role;
}
GetUsername() { const token = this.tokenGetter(); if (!token) { return; } let tokenData = this.jwtHelper.decodeToken(token); let username = tokenData[ "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name" ]; return username;
}